Disk type electromagnetic valve

ABSTRACT

A disk type electromagnetic valve comprising a disk valve floatingly arranged within a pressure chamber which is formed by a main body and a cover member, the opening and closing of the disk valve are hydrodynamically effected, and the pressure exerted from behind said disk valve for closing it is controlled by opening and closing a pilot valve under the influence of a small-type solenoid.

United States Patent 1191 Fujiwara 1 Sept. 11, 1973 {54] DISK TYPEELECTROMAGNETIC VALVE 1,005,703 10/1911 Goeddel 251/43 [76] Inventor:Katsuji Fujiwara, 191 Mishitani, fliraoka-cho, Kakosawa, 3,218,02211/1965 Lewis....;.... 251 /141 x y g Japan 3,381,932 5/1968 OKane251/30 [22] Filed: Dec. 22, 1971 [2]] App| 2 0 7 7 PrimaryExaminerArnold Rosenthal Attorney-Totem and McGeady [30] ForeignApplication Priority Data Jan. 13, 1971 Japan....; 46/675 (utilitymodel) Mar. 11, 1971 Japan 46/13299 (utility model) [57] ABSTRACT June22, 19' Japan 46/54537 (Utility model) A yp electromagnetic valvecomprising a disk valve floatingly arranged within a pressure chamber[52] US. Cl l37/625.48, 251/30, 251/43 which is formed by a main bodyand a cover member [51] I11. Cl......' Fl6k 31/40 the p g and l g of thei k valve are y y [58] Field of Searcl 251/30, 43, 44; namicauy effectedand the pressure exertedfrom 137/625 hind said disk valve for closing itis controlled by open- I ing and closing a pilot valve under theinfluence of a [56] References Cited smawtype solemn UNITED STATESPATENTS 203,947 5/1878 .Saunders 137/608 7 Claims, 3 Drawing FiguresPATENTED EH 3.757. 821

sum 2 or 2 Fig.2

INVENTOR 419N007 For: Mm

BY Mm ATTORNEY 1 DISK TYPE ELECTROMAGNETIC VALVE BACKGROUND OF THEINVENTION fluid is considerably limited due to the use of the sealrings;and results in a large question in respect of its durability. While, inthe diaphragm or the Bellofram, the working range thereof is limitedwith the result that it is unsuitable for a large capacity, and in thebellows, the cost of production becomes higher, thus all of thestructures are complex, and the shape of whole valve becomes larger andthe assembly as well as the maintenance thereof becomes more difficult,therefore its practicability is deficient.

Further, the above pilot type electromagnetic valve is so constructedthat opening and closing of the main valve are effected by the pressuredifference between the upper and lower faces of the main valve accordingto the opening and closing of a pilot valve, 50 that at thetime of valveopening, the main valve trembles violently due to flow resistance orchange of dynamic pressure and the like caused by exhausting fluid, andis very unstable and also it is very difficult to obtain a sufficientflow.

SUMMARY. THE'INVENTION This invention relates to disk typeelectromagnetic valves, which can open a valveport having large apertureaccording to the opening and closing of a pilot valve by a small-typesolenoid.

It is an object of this invention to eliminate the aforementioneddisadvantages by the provision of a disk type electromagnetic valve,which is simple in construction, is easy to assemble and maintain, andis economical.

Accordingly, the present invention provides a electromag netic valve,wherein at a'main valve portion, a disk valve working hydrodynamically,is used, and the pressure (within a pressure chamber) which exerts itsforce from behind the disk valve for closing the same is controlled bythe opening and closing of a pilot valve under the influence of asmall-type solenoid, thus, opening and closing of the disk valve areeffected.

Therefore, the high accuracy finishing is not necessary and the workingfluid is not limited such as in the case of conventional valve, and avalve port having a large aperture can be opened by a small-typesolenoid.

Another object of this invention is to obtain a disk typeelectromagnetic valve which can be kept in a stable state when it isopened.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectionshowing an embodiment of the present invention.

FIG. 2 is a longitudinal section showing an alternate embodiment of thepresent invention.

FIG. 3 is a plan of a main body showing still another embodiment of thepresent invention.

In FIG. 1, a main body 1 is provided with an inlet port a 5 2, an outletport 3 and a valve seat portion 4. On the central portion of the valveseat portion 4, an inflow port 5 communicating with the inlet port 2 isprovided, and around the inflow port 5, an inner and an outer annularvalve seat 6, 7 is provided and between these valve seats 6, 7, anannular groove 8 is provided, and further the annular groove 8communicates with the outlet port 3 through an exhaust port 9. On thevalve seat portion 4 of the main body 1, a cover member 10 is attachedthrough a packing 11, whereby a pressure,

chamber 12 is formed. In the pressure chamber 12, a disk valve 13 isfloatingly arranged, and the disk valve 13 is provided with an orifice14 communicating between the pressure chamber 12 and the side of theinlet port 2 at the time of valve closing, and, further, a very smallclearance is kept between the disk valve 13 and an inner wall of thecover member 10 and the periphery of disk valve 13 is chamfered so as toprevent the disk valve 13 from being caught. by the inner wall of thecover member 10, and so as to be able to open and close smoothly.

In the cover member 10, a pilot port 17 communicates between thepressure chamber 12 said the side of the outlet port 3 through passage(15 or 16), and a pilot valve seat 18 is provided around the pilot port17.

Further, on the upper cover member 10, a solenoid 20 containing amovable core 19 is attached, and on the core 19 is pusheddownwardlybythe spring 22 and the pilot valve 21 is closed. Therefore, the pressurechamber .12 communicates with the side of the'inlet port 2 through theorifice 14,.so that the disk valve 13 is closed. Next, when thesolenoid20 is energized, the core 19 is attracted upwardly against theelastic force of the spring 22, and the pilot port 17 is opened. Ac-

cordingly, the pilot port 17 is preliminarily made largerthanthe orifice14 of the disk valve 13, so that the pressure within the pressurechamber 12 becomes lower,

thus the disk valve 13 is opened. Because the periphery of the diskvalve 13 is chamfered, the disk valve 13 is smoothly opened withoutbeing caught by the inner wall of the cover member 10, and is pushed onthe upper wall of said cover member 10. In this condition, the pressureexerted on the lower face of the disk valve 13 is larger than thepressure exerting on the upper face of the disk valve 13, so that it ispossible to keep a very stable opening condition, and even if the diskvalve 13 receives flow resistance by exhausting fluid, the disk valve 13would never tremble. V r

In order to close the valve again, it is sufficient to cut off thecurrent in the solenoid 20, then the solenoid 20 is deenergized and thepilot port 17' is closed. Thus, the pressure exerted on the upper faceof the disk valve 13 becomes higher, while the pressure exerted on thelower face of the disk valve 13 becomes lower in accordance withBernoullis theorem, so that the disk valve 13 is attracted to the valveseat for closing the valve. In such a manner, the opening and closing ofthe disk valve 13 is effected.

In this embodiment, the disk valve 13 is provided with the orifice 14 soas to be able to supply the pressure into the pressure chamber 12 inorder to prevent the opening of valve due to a pressure drop within thepressure chamber 12 in case of a leak from between the disk valve 13 andthe outer annular valve seat 7, however, when the disk valve 13, theinner annular valve seat 6 and the outer annular valve seat are finishedminutely, a similar effect may be obtained without the orifice 14.

The construction of this embodiment is such that when the solenoid isdeenergized, the disk valve 13 is closed, and when the solenoid 20 isenergized, the disk valve 13 is opened.

In the embodiment shown in FIG. 2, the disk valve 13 is provided with aprotrusion 25, and, when the disk valve 13 is opened, the protrusion ispositioned within the magnetic field of the solenoid 20, thus the diskvalve 13 is attracted by the solenoid 20, and the valve is kept open.Therefore, the valve is opened in a very stable state, and sufficientflow may be obtained.

Further, when a main body having three discharge ports 3 as shown inFIG. 3 is used, it is possible to discharge and intercept in three waysaccording to opening and closing of the disk valve at the same time,and, moreover, it is possible to discharge and intercept in plural waysby changing the number of the discharge ports.

In this manner, the electromagnetic valve,.according to the presentinvention, isconstructed so that the disk valve effectedhydrodynamically is used as a main valve portion, and the pressureexerted from behind the disk valve for closing the same is controlled bythe opening and closing of the pilot valve under the influence of asmall-type solenoid, thus the opening and closing of the disk valve iseffected, and the disk valve is provided with an orifice communicatingbetween the pressure chamber'and the side of the inlet port so as tokeep the valve closing force when the valve is closed, and, further, aconsiderable small clearance is kept between the disk valve and an innerwall of the cover'member, and the periphery of disk valve is chamferedso as to preventthe disk valve from being caught by the inner wall ofthe cover member.

Therefore, at the main valve portion, a complex sliding portion such asa conventional piston-cylinder mechanism and a seal-ring such as aO-ring and the like are not used, so that the opening and closing of thedisk valve is smoothly effected without any frictional resistance aswell as without any limit due to the workingtion and a passageconnecting said inflow port to said inlet port, said surface includingan annular valve seat extending about said inflow port and an outerannular valve seat spaced radially outwardly from said inner annularvalve seat, an annular groove formed in said surface and located betweensaid inner annular valve seat and said outer valve seat, said main bodyforming an exhaust port and passage connecting said annular groove andsaid outlet port, a cover member secured to said main body and coveringsaid surface forming the valve seat portion and forming in combinationtherewith a pressure chamber containing said inner and outer annularvalve seats, a-disk valve floatingly positionable within said pressurechamber and displaceable 4 between a first position in contact with saidinner and outer annular valve seats and a second position spaced fromsaid inner and outer valve seats, said disk valve having a peripherywhich is chamfered and spaced closely from the juxtaposed surface ofsaid cover member forming the lateral surface of said pressure chamberand providing a small clearance therebetween, said cover memberincluding a pilot port in communication with said pressure chamber and athrough passage arranged in communication with said outlet port and saidpilot port, a solenoid assembly including a core and a pilot valvesecured to said core, said pilot valve being coaxially disposed relativeto said disk valve, said pilot valve being arranged to open and closesaid pilot port at the end thereof opposite said pressure chamber endsin response to the energizing and deenergizing of said solenoid assemblyfor selectively admitting flow be- .tween said pilot port and saidthrough passage so that through communicating between the inflow portside ofsaid pressure chamber and said pilot port side of said pressurechamber so that said pressure chamber is in communication with saidinflow port when said disk valve is in its first position.

3. A disk type electromagnetic valve, as set forth in claim 2, whereinthe diameter of the said orifice in said disk valve is less than thediameter of said pilot port.

4. A'disk type electromagnetic valve, as set forth in claim 1, whereinsaid solenoid assembly when energized has a magnetic. field, said diskvalve located within themagnetic field of said solenoid assembly so thatsaid disk valve is displaced into itsopen position when said solenoidassembly is energized.

5. A disk type electromagnetic valve, as set forth in claim 4, whereinsaid disk valve includes a protrusion on the side thereof opposite saidinflow port and said protrusion extends in the direction of movement ofsaid valve disk away from said inflow port and is positioned within themagnetic field of said solenoid assembly.

6. A disk type electromagnetic valve, as set forth in claim 1, whereinsaid solenoid assembly includes spring means associated with said corefor biasing it in a direction opposite to the direction in which it isbiased by the energizing of said solenoid assembly.

7. A disk type electromagnetic valve, as set forth in claim 1, whereinsaid main body has a plurality of outlet ports.

1. A disk type electromagnetic valve comprising a main body, said mainbody including an inlet port, an outlet port spaced from said inlet portand a surface forming a valve seat portion, said main body forming aninflow port in said surface forming the valve seat portion and a passageconnecting said inflow port to said inlet port, said surface includingan annular valve seat extending about said inflow port and an outerannular valve seat spaced radially outwardly from said inner annularvalve seat, an annular groove formed in said surface and located betweensaid inner annular valve seat and said outer valve seat, said main bodyforming an exhaust port and passage connecting said annular groove andsaid outlet port, a cover member secured to said main body and coveringsaid surface forming the valve seat portion and forming in combinationtherewith a pressure chamber containing said inner and outer annularvalve seats, a disk valve floatingly positionable within said pressurechamber and displaceable between a first position in contact with saidinner and outer annular valve seats and a second position spaced fromsaid inner and outer valve seats, said disk valve having a peripherywhich is chamfered and spaced closely from the juxtaposed surface ofsaid cover member forming the lateral surface of said pressure chamberand providing a small clearance therebetween, said cover memberincluding a pilot port in communication with said pressure chamber and athrough passage arranged in communication with said outlet port and saidpilot port, a solenoid assembly including a core and a pilot valvesecured to said core, said pilot valve being coaxially disposed relativeto said disk valve, said pilot valve being arranged to open and closesaid pilot port at the end thereof opposite said pressure chamber endsin response to the energizing and deenergizing of said solenoid assemblyfor selectively admitting flow between said pilot port and said throughpassage so that the pressure within said pressure chamber is controlledto effect the opening and closing of said disk valve.
 2. A disk typeelectromagnetic valve, as set forth in claim 1, wherein said disk valvehas an orifice therethrough communicating between the inflow port sideof said pressure chamber and said pilot port side of said pressurechamber so that said pressure chamber is in communication with saidinflow port when said disk valve is in its first position.
 3. A disktype electromagnetic valve, as set forth in claim 2, wherein thediameter of the said orifice in said disk valve is less than thediameter of said pilot port.
 4. A disk type electromagnetic valve, asset forth in claim 1, wherein said solenoid assembly when energized hasa magnetic field, said disk valve located within the magnetic field ofsaid solenoid assembly so that said disk valve is displaced into itsopen position when said solenoid assembly is energized.
 5. A disk typeelectromagnetic valve, as set forth in claim 4, wherein said disk valveincludes a protrusion on the side thereof opposite said inflow port andsaid protrusion extends in the direction of movement of said valve diskaway from said inflow port and is positioned within the magnetic fieldof said solenoid assembly.
 6. A disk type electromagnetic valve, as setforth in claim 1, wherein said solenoid assembly includes spring meansassociated with said core for biasing it in a direction opposite to thedirection in which it is biased by the energizing of said solenoidassembly.
 7. A disk type electromagnetic valve, as set forth in claim 1,wherein said main body has a plurality of outlet ports.